testnet: start from init script and add missing dependency

testnet/Makefile

@@ -10,6 +10,7 @@ include $(INCLUDE_DIR)/package.mk
 define Package/testnet
   CATEGORY:=Utilities
   TITLE:=Check WAN IP Connection
+  DEPENDS:=+ndisc6
 endef
 
 define Package/testnet/description

testnet/files/etc/hotplug.d/iface/05-testnet

@@ -14,8 +14,4 @@ interface_check() {
 }
 
 interface_check
-if [ -n "$(pgrep -f testnet)" ]; then
-	testnet once
-else
-	testnet &
-fi
+/etc/init.d/testnet reload

testnet/files/etc/init.d/testnet

@@ -0,0 +1,23 @@
+#!/bin/sh /etc/rc.common
+
+START=21
+STOP=10
+USE_PROCD=1
+
+TESTNET=$(which testnet)
+
+start_service() {
+	# do not start testnet if the feature is explicitly disabled
+	[ "$(uci -q get testnet.global.enabled)" = "0" ] && return 0
+
+	[ -n "$TESTNET" ] && {
+		procd_open_instance
+		procd_set_param command "$TESTNET"
+		procd_set_param respawn
+		procd_close_instance
+	}
+}
+
+reload_service() {
+	[ -n "$TESTNET" ] && procd_running testnet && "$TESTNET" once
+}